The union of two or more adjacent boils results in what condition?

The correct answer is carbuncle, which refers specifically to a cluster of boils that occur in close proximity to one another. Each boil is typically an infected hair follicle, and when multiple boils merge, they create a larger, inflamed area known as a carbuncle. This condition often results in a deeper infection that can be more severe and painful compared to a single boil. The skin around the carbuncle may appear red and swollen, and it can contain pus that may drain.

The other terms have distinct meanings that differ from the concept of a carbuncle. An abscess, for example, is a localized collection of pus that can occur independently of the boils or as a result of infections in various tissues but is not specifically a union of adjacent boils. Exudate refers to the fluid that drips out of blood vessels into nearby tissues, typically as part of the inflammatory response, and does not pertain specifically to boils or their union. Gumma, on the other hand, is a soft, tumor-like growth resulting from syphilis, and it is not related to infectious boils at all. Thus, the definition of carbuncle is what makes it the correct choice in this context.